Noun: dark horse
- A political candidate who is not well known but could win unexpectedly
"The dark horse candidate surprised everyone by winning the primary election"
- A racehorse about which little is known
"The dark horse surprised everyone by winning the derby"
Derived forms: dark horses
Type of: bangtail [US, informal], campaigner, candidate, neddy [Austral, informal], nominee, pony [informal], race horse, racehorse
Encyclopedia: Dark horse